#include <stdio.h>
#include <math.h>
int main()
{
	double fResultatan;
	double fResultatan2;
	double fResultatan3;
	double fResultatan4;
	
	double jiao1;
	double jiao2;
	double jiao3;
	double jiao4;
	
	double fXatan = 0.5;
	double fXatan2 = 0.5;
	double fXatan3 = 0.5;
	double fXatan4 = 0.5;
	 
	double jiao = 360;
	jiao = jiao1 + jiao2 + jiao3 + jiao4 ;
	
	
	fResultatan = atan(fXatan );
	fResultatan2 = atan(fXatan2);
	fResultatan3 = atan(fXatan3);
	fResultatan4 = atan(fXatan4);
	
	printf("the arctan of %lf is %lf\n ",fXatan,fResultatan);
	printf("the arctan of %lf is %lf\n",fXatan2,fResultatan2);
	printf("the arctan of %lf is %lf\n",fXatan3,fResultatan3);
	printf("the arctan of %lf is %lf\n",fXatan4,fResultatan4);
	return 0;

}
